Support long long when possible for INT64

    Support use of "long long" under GCC (>2.95) and when compiled
	for Solaris with 64 bit support.  For VxWorks, the definition

		#define VxWorksDefinesINT64

	should be put in drama_local.cf if using VxWorks 5.5 or later to
	allow this to work correctly.  (Otherwise an errir about INT64
	being already defined will appear)